I just had my floor redone with tile and I went to go set up my new 180(hence why the floor got tiled) and it was not level at all . Its off over 1/2 inch the length of the tank. the tile right in the middle is where the problem is and is causing the hump. You could rock the stand side to side. Right now I am trying foam between stand and floor to see if that works. I talked to the guy who installed the tile and he said that he cant make it perfectly level because the tile would be different heights. He says to get the tank level with a few shims then GROUT the stand in place by smashing it under the stand. He said it will get as hard as concert and wont have a problem. I have had this 180 for 4 months now and just want to get it up but dont want to wait, I know it needs to be done right... Hope someone can give me a few ideas or tell me what the best thing to do it. Im getting frustrated......:headwally: